Reading the entry on the blog claims that they are unused designs for Beast Wars:

"Beast Wars

Not many unproduced "Beast Wars" prototypes have turned up, but there was an interesting set of concept drawings that surfaced. Among these are Transmetal versions of characters that did not get Transmetal (I) figures...Scorponok, Tigatron and Blackarachnia. There are also a couple of unproduced Fuzor characters, one of which looks like Optimus Primal as a griffin! These look like they would have been great additions to the Beast Wars."

Reading the entry on the blog claims that they are unused designs for Beast Wars:

"Beast Wars

Not many unproduced "Beast Wars" prototypes have turned up, but there was an interesting set of concept drawings that surfaced. Among these are Transmetal versions of characters that did not get Transmetal (I) figures...Scorponok, Tigatron and Blackarachnia. There are also a couple of unproduced Fuzor characters, one of which looks like Optimus Primal as a griffin! These look like they would have been great additions to the Beast Wars."

Click to expand...

The website these photos originally came from, stated it was actual fanart, entered in the art contest. They are not unused concept art from Hasbro or Takara.